Expandable Earpiece Seal for Noise Attenuation
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Solution Overview
Problem
Existing ear protection devices fail to effectively attenuate ambient noise while minimizing the occlusion effect, which can lead to discomfort and reduced situational awareness, and are not universally compatible with varying ear canal shapes and sizes.
Innovation Solution
An expandable earpiece device with a sealing section that contacts both cartilaginous and bony regions of the ear canal, using an inflatable or electro-active polymer element to create a comfortable acoustic seal, reducing sound transmission through bone conduction and occlusion effects, and incorporating electronic components for sound monitoring and noise attenuation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If static earplugs are used to shield the inner ear from high decibel noise, then hearing protection is provided, but the occlusion effect causes discomfort and reduced situational awareness
Solution Approach 1:
The earpiece device transitions from a static seal to a dynamic expandable seal. The sealing section is inserted in a compressed state and then expanded within the ear canal to form a seal, allowing the device to adapt to different ear canal sizes and shapes while providing effective noise attenuation without excessive occlusion effect
Solution Approach 2:
The device changes the physical state of the sealing section from compressed to expanded form. This parameter change allows the sealing section to progressively engage with the ear canal wall, creating an effective seal that blocks ambient noise while maintaining comfort and situational awareness
2Adaptability or versatility
If ear protection devices are designed to fit various ear canal shapes and sizes, then universal compatibility is improved, but device complexity increases
Solution Approach 1:
The sealing section is nested within the housing in a compressed state for compact storage and easy insertion. Once inserted into the ear canal, the sealing section is expanded from its nested state to form a seal that adapts to the ear canal's geometry, providing universal compatibility without requiring multiple device variants
Solution Approach 2:
The device uses a dynamic expansion mechanism that allows the sealing section to transform from a compact inserted state to an expanded sealed state. This dynamic behavior enables a single device design to accommodate various ear canal sizes and shapes, eliminating the need for complex multiple-size variants
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The device provides significant noise attenuation (up to 40 dB) and reduces the occlusion effect, ensuring comfort and situational awareness by effectively sealing the ear canal across a wide range of ear sizes and shapes, while allowing for the monitoring of ambient sounds to prevent hearing damage.
Implementation Method 1
an expandable element for expanding within the ear canal to seal the ear canal opening
Implementation Method 2
an inflatable system that uses internal pressure to form a seal against the ear canal wall
Implementation Method 3
an electro-active polymer expandable device that uses electrical stimulation to change shape and seal the ear canal
Data Source
AI summary
Acoustic reflective devices are provided. An acoustic reflective device is configured to be inserted into an orifice. The device includes a stressing device that can vary a volume in response to a voltage difference across a portion of the stressing device. The stressing device is at least partially surrounded by a membrane.